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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Jun 2000 Posts: 2,773 'Bolter | | 'Bolter Joined: Jun 2000 Posts: 2,773 | You probably have the TH400 tranny, the way to identify it is by the shape of the pan. Go here: http://www.novak-adapt.com/knowledge/th400.htm Your differential should be either a 10 or 12 bolt, you count the number of bolts in the cover. From my knowledge of these you should have a 4.10 gear ratio, since you have the automatic. Standard tranny was the SM465, which came with 4.57 gears.
Fred
52 3600
69 C-10
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